发布时间:2025-01-29 17:48:57
噪声有很多种类型;
低频噪声,即使噪声值较小,人耳感觉仍然很难听,且能够传很远。
冰箱噪声国标规定的测点在冰箱的前后左右各一个,如果在前面测声压级的话,测点位置为冰箱高度加1米后除以2,测点高度;冰箱长度除以2后加1米;两个数值确定测点位置。
且冰箱产品名牌上面标注出来的噪声值指的是“声功率级”,而不是“声压级”。
在老家里面我睡觉的二楼床头外面外墙有一个铁架子用来拉电话接跟电线会不会影响我风水我感觉睡都不踏实
2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57问下我想给装修施工队起个名字可是怕与别人注册的重名该怎么注册个名字或该怎么避免和别人名字相同
2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57 2025-01-29 17:48:57